Deepwater oil and gas well casing bypass annulus pressure releasing device and method thereof

Abstract

The invention relates to a deepwater oil and gas well casing bypass annulus pressure releasing device and method, the device comprises an annular structure and a bypass pipe, the annular structure is arranged on an inner layer casing in a sleeving mode and used for centralizing the inner layer casing; a plurality of pressure relief pipelines are arranged in the annular structure, a plurality of pressure relief holes are formed in the outer side wall of the annular structure, and the pressure relief pipelines are communicated with the pressure relief holes; the bypass pipes are arranged in the circumferential direction of the inner-layer sleeve, and the lower ends of the bypass pipes extend into the annular structure and communicate with the pressure relief pipeline. On the premise that the safety and integrity of the casing pipe structure are not affected, the bypass pipe is additionally arranged and communicated with the stratum to release the annular pressure, the problem that the annular pressure cannot be released due to blockage of a pressure relief channel is solved, and repeated use can be achieved.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploitation, in particular to a deep-water oil and gas well casing bypass annular space pressure release device and a method thereof. Background technique [0002] For the development of oil and gas wells at subsea wellheads, during the production process, the annular fluid in the casing expands to generate annular pressure, which poses a threat to the safety of the casing structure. In the prior art, annulus pressure is released by installing a rupture disk on the casing or connecting the formation through the bottom of the annulus. When there is annulus fluid and solid-phase particles depositing and accumulating in the air pressure, the pressure relief channel is blocked, so that the release of annular pressure cannot be guaranteed for a long time, and the casing still has the risk of being crushed. [0003] In addition, subject to the requirements of industry standards and enterprise stan...

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Problems solved by technology

[0004] In view of the above problems, the first object of the present invention is to provide a deep-water oil and gas well casing bypass annulus pressure release device, which can communicate with The formation releases the annular pressure, avoiding the problem that the annular pressure cannot be released due to the blockage of the pressure relief channel, and can be used many times

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